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3 years ago

The difference between eight times a number and three is equal to negative 19 .what is the number?

Mathematics

1 answer:

andrezito [222]3 years ago

3 0

Answer:

The answer is -2.

Step-by-step explanation:

In order to solve the problem, you need to first set up an equation, with a variable, and solve using inverse operations. Using context clues from the problem, we know that 'difference' is subtraction, 'times' is multiplication and 'equal' is the equal sign, or total. So, using the numbers and clues, I can set up the following equation: 8x - 3 = -19. To solve for 'x' I need to first add 3 to both sides of the equation to get 8x = -16. Next, I need to divide both sides of the equation by 8 to get x = -2. Therefor, your final answer is -2. You can double-check by putting this number into the equation and solving: 8x(-2) - 3 = 16, or -16 - 3= -19, -19 = -19.

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3 years ago

X^2+1x-2=0 What could the answer be ?please help me .

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4 years ago

Read 2 more answers

1: Triple the quantity of a number “n” plus 4 equals 27. what would the expression look like?

Diano4ka-milaya [45]

1: Triple the quantity of a number “n” plus 4 equals 27. what would the expression look like?

[ Triple the quantity of a number “n” ] 3n

[ plus 4 ] + 4

[ equals 27 ] = 27

[ all together ] 3n + 4 = 27

Solving:

[ given ] 3n + 4 = 27

[ subtract 4 from both sides ] 3n = 23

[ divide both sides by 3 ] n = 7 $\frac{2}{3}$

2:Seventeen equals seven less than three times a number “n” what would the expression look like?

[ Seventeen equals ] 17 =

[ seven less than ] - 7

[ three times a number “n” ] 3n

[ all together ] 17 = 3n - 7

Solving:

[ given ] 17 = 3n - 7

[ add 7 to both sides ] 24 = 3n

[ divide both sides by 3 ] 8 = n

Have a nice day!

I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)

- Heather

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3 years ago

Select the correct answer. Which sequence is not equivalent to the others?

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3 years ago

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SOMEONE HELP?!! ASAP !! I’ll give brainliest!! Please and ty !!

dsp73

Answer:

$(\pi 4^2 (9))-(\pi 2^2 (9))$

and

$339.292 cm^3$

Step-by-step explanation:

This question is simple once you break it down.

Let's concentrate on the outer cylinder.

First, find the volume of the outer cylinder.

The volume of a cylinder is expressed as: $V = \pi r^2 h$

Gathering information from the diagram..

d = 8 cm

h = 9 cm

You can get the radius from the diameter by just dividing the diameter by 2.

$r = \frac{8}{2}=4$

r = 4

Plug everything into the volume equation.

$V = \pi 4^2 (9)$

Don't solve just yet!

Now, find the volume of the inner cylinder.

Do the exact same thing as you did for the outer cylinder.

d = 4 cm

h = 9 cm

$r = \frac{4}{2}=2$

r = 2

Plug everything into the volume equation..

$V = \pi 2^2 (9)$

The question asks for an expression to represent the volume of the large cylinder after the cylindrical hole is removed. This means you need to subtract the volume of the cylindrical hole from the volume for the large cylinder.

Again, the volume for the large cylinder is $V = \pi 4^2 (9)$ and the volume for the cylindrical hole is $V = \pi 2^2 (9)$

This means..

$(\pi 4^2 (9))-(\pi 2^2 (9))$

That is your answer to the first part of the question.

For the second part, just solve.

$(\pi 4^2 (9))-(\pi 2^2 (9))$

$(\pi*16*9)-(\pi*4*9)$